Process of manufacturing metal rings



MJT. LO TH ROP. v PROCESS OF MANUFACTURING METAL RINGS. v APPLICATION FILED .JAN. 26. 1921- 4 Patented Jan. 3,1922% tai tyhioh is only. approximately circular in ma NAMES 'Z'l LOTHRDP; OF CANTQN, OHIO, Aj$$IGNOB TO THE TIIMKEN ItQLLEB. BEARING 'C'OMPANY, 0F CAN'IGN, OHIO, A CORPORATION OF OHIO.

To all 'wZZ-OIYL it may concern Be it known that I, Marcus '1. Lo'rHRoP, a citizen of the United States, and aresident of the city of Canton, in the county of Stark and the State of Ohio, have invented a new and useful Improvement in Processes of Manufacturing Metal Rings, of which the following is a specification.

My invention relates to the manufacture of metal rings and tubular articles, and has for its principal objects to simplify and cheapen the process ofmanufactnring such articles and to make them with a more accurately formed and highly finished borev than is. practicable by other processes' The invention consists principally in forming the here with a roughly circular cross section of substantially the diameter desired for the finished article and obliterating the irreguuarities by forcing endwise thereof a plug of circular section and of a diameter very slightl larger than that desired for the finished ore; and the invention also consists in settin the tool that cuts the bore so as to ClliLtiGl', (that is, tremble and cut numerous indentations in the work); and then forcirg a highly finished and hardened sphere through the irregular bore thus formed, thereby giving said bore a high degree of finish and a true cylindrical form. In the drawings wherein like reference numerals indicate like parts in the several views, Fig. 1 is a sectional view showing a roller beari g cone having a bore formed with irregula ities therein according to my invention and3 a sphere in position to be forced therethr ugh; and

Fig. 2 's a similar view showing the fin ished conhwith a smooth cylindrical bore of slightly larger diameter than that of the rough cone shown in Fig. 1. r

One stage in the process of manufacturing metal rings such as roller bearing cones, commonly practiced, comprises the turning of the cylindrical bore thereof in a screw machine or the like. According to my-pio ccssthe cutting tool is set above or below the center line ot-the Work; instead of at the center line of the work (which is the common practice). The result ofithe cutting center line of the work-is that it chatters, that is, jars or trembles ahd produces a bore of such screw machine.- 7,

tool not being at the PRQGESS or manoracrunme METAL mes.

Specification of Letters Patent. Patented Jan, 3, 1922. Application filed January 26, i921. Serial No. 440,040.

tion, the circularity of said bore being broken by numerous ridges and indentations; The bore of the cone has thus a multiplicity pressed down by the sphere, instead of being roken off or folded over.

As the sphere .is pressing against relatively small areas at a given time, its work is made easy and the results of the passing of the sphere through the bore are more permanent. The flattening down of the ridges tends to set up a plastic flow of the metal of the cone, causing the low spots to'iill up and giving the bore the proper formand a highly finished surface.

On. account of the elasticity of the metal, the cone will spring in or shrink slightly after the sphere has passed through it, and for this reason the diameterofthe sphere should be slightly A conehaving the plurality of radially projecting small areas produced by the chat-- tcring of the cutting tool is better adapted for the subsequent operation of forcing the sphere through the bore thereof than is a larger than that desired for the bore of the finished ring' cone which is turned in the usual manner with a cutting tool set at the center line because it distributes the work to be done by the sphere in small quantities and affords space for a plastic flow of the metal. By my process a smooth and regular surface is formed, the tearing or breaking off of parts of the cone such as are incidental to grinding and like operations are minimised, and as the sphere has to do only a comparatively small amount of work at aigiven' time, the results of the work are more permanent.

Instead of a sphere a plug of circular cross section and having a comparatively small working surface may be usedto smooth the irregularities of the bpre:

The turning of the bore is not an essential step of my process, as it is possible to roduce a bored 'aving the desired irreguarity in other ways,

-1. The process of fmakingmetal r' I which comprises 'forming the roughartic c with a substantially cylindrical bore having a multiplicity of radially projecting and longitudinally extending ridges and then forcing through said borea plug having a. 1 comparatively small working surface of circular cross section slightly larger than the diameter of said bore. v l 2. The process of making metal rings such as cones for roller bearings ,'which comprises 'cnttingthe bore thereof. by means of a' cutting tool set to leave v lsoradially' projecting and longitudinally exa multiplicity of J tending ridges therein and then forcing v'through said borer-a hardened and highly finished-sphere of slightl larger diameter than the diameter of sai bore. ;3. The process ofmaking metal rings,- such as cones for roller bearings, which comprises turning'the' cylindrical bore thereof with a tool set to chatter and then forcing through said bore a hardened and highly finished spherical body of slightly larger 25 diameter than the diameter of said bore.

Signed at Canton, Ohio, this 20th day of Jan, 1921; V

MARCUS T. LoTHRoP; j a 

